It all started on July 23, when John Holt was taking care of chores around their home in Dummer. He had just finished cutting the grass and parked his lawn mower in the barn, which is connected to their house.

After spotting smoke coming from their conservatory about 20 minutes later, Holt opened the door of the decades-old barn to find an inferno. The mower is believed to have sparked the blaze.

After dialing 911, Holt handed the phone to his 8-year-old son Harrison to talk to a dispatcher, and tried to douse the flames with a fire extinguisher, but it was not enough to stop it.

Meanwhile, Harrison ran into the family's living room, scooped up his 11-month-old sister Marie and headed to the family's pre-designated safety location — an oak tree in their front yard — where his brother Patrick, 5, was waiting.

Holt then spotted his children all under the oak tree and safe from harm.

“Harrison was standing next to him [Patrick] and had Marie under one arm and the phone in the other arm,” Holt told InsideEdition.com. “Both of them were completely calm, especially holding Marie. [Harrison] carries her a lot so he had her wedged under one arm.”

Holt says the closest fire department is out of their town, about 20 minutes away.

He said Dummer is such a small town that they have no access to public water or fire hydrants, so the department had to stop to pump water into its trucks before arriving.

With no fire department nearby, the family could only watch as their home burned to the ground.

“It was a surreal experience,” Holt said.

Once the Milan Fire Department arrived, they took note of Harrison’s noble actions.